燃料(如煤、石油)加热锅炉中的水，产生蒸汽。
A fuel such as coal or oil heats water in a boiler and steam is produced.
加热单元是包含加热机构和起保护作用的绝缘材料的加热锅。
The heating unit is a heating pan comprising a heating mechanism and insulation for protection.
加热锅颠倒放在蒸煮锅上时，以便它们也位于可交换的位置上。
The heating pan, when upside down fits upon the cooking pan, so that they are also in interchangeable positions.
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